Wow, I've been doing this for a while but didn't think of looking for a forum that discussed it. I never thought I would be telling anyone of my "secret world".
For me I discovered it by noticing things weren't right. "this isn't my house" Then when I realized it wasn't real and I was dreaming I started exploring. (it took a few times) I would walk into any house I saw. The people are always passive. I would be able to go any where with no one bothering me. I think it's awsome!